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Tiny tubes are prone to big blockages.

In most installations, the zone valves are in the returns.

Engineers question the quality and performance of copper and aluminum windings in motors.

It’s never a waste of time to review TEVs — their operating principles, installation, maintenance, and troubleshooting.

What happens if a system doesn't have a defrost/termination/fan delay control?

Devices used to measure subcooling, evaporator superheat, and total superheat save time, money and aggravation.

Learning to understand the relationship between motor and speed and poles will help you become a more effective field service technician.

Reversing valves can be difficult to remove because they have four solder joints to deal with at the same time and, to make matters worse, they are very heat sensitive.

A quick review of EPR valve basic designs, principles of operation, and application of these valves.

Here are some tips to a quick recovery after experiencing a solenoid valve malfunction.